Tinning apparatus



Nov. 30 1926.

D. J. FAHLMAN TINNING APPARATUS Filed Sept. 15, 1924 @M www /Wx/mw@ Patented Nov. 30, 1926.

UNITED STATES DUNCAN J". IFAI-ILMAN, OF DETROIT, MICHIGAN, ASSIGNOR TO BUHL STAMPING COM- PANY, OF DETROIT, MICHIGAN, A CORPORATION 0F MICHIGAN.

'IINNING APPARATUS.

Application filed September The invention relates to apparatus for tinning hollow ware, such, for instance, as milk cans, and has more particular reference to the means for stripping the surplus molten tin from the surface of the article. In the present state of the art articles which have been coated with molten tin are immersed in a heated bath of stripping compound, which uniformly distributes the tin over the surface of the article, removing the surplus. lWhere hollow articles, such as mill; cans, are treated in this manner it has been found ditiicult to immerse them in the stripping compound because of their buoyancy, and it is also diilicult to properly treat the inner surface of the can. I have therefore devised a construction of apparatus which permits the immersion of the hollow article without material displacement et the stripping liquid and without the necessity of overcoming hydrostatic pressure.

In the drawings:

Figure l is a vertical longitudinal section through the apparatus;

Figure 2 is a plan view thereof.

A is a suitable heating furnace in which is located the vat or tank B containing the molten stripping` compound. (l is a conduit extending upward within the tank B to a point slightly above the normal level of the stripping compound and preferably having its upper end slightly flared as at l) to avoid the slopping of the liquid into the tube. The conduit C at its opposite end is connected with the atmosphere and as shown this is accomplished by means of the laterally eirtending pipe E at the bottom oir' thetank and the upwardly extending pipe F at the corner of the tank, terminating` in a lateral pipe G which is vented to the atmosphere. I also preferably provide a plurality ot the vertical pipes C, as indicated at C', C2, all being connected with the vent pipe.

Vith the construction as described, a hollow article such as the mill: can I-I, after being coated with the molten tin, is inverted and pressed 'downward in the stripping compound in a posit-ion to surround one of the vertical pipes C. As this pipe is vented to theatrnosphere, the air within the can can 15, 1924. serial No. 737,789.

be displaced without the development of more than atmospheric pressure, thereby permitting the easy in'nnersion and `wit-hdrawal of the can `from the stripping compound. This also facilitates a proper treatment ot the inner surface of the can, as the stripping compound is not agitated or displaced Jfrom its normal level.

While I have described my apparatus for this specific use of stripping molten tin, it

obvious that it may be used for other purposes where for any reason it is desirable to iminerfe a hollow article in a liquid bath.

TWhat I claim as my invention is:

l. The combination with a liquid container, of a conduit extending1 upward within said container to a point above the level o'l the liquid therein, the lower end of said conduit being vented to the atmosphere.

The combination with a liquid container, of a cond it extending upward within said container to point above the level of the liquid, said conduit being vented to the atmosphere outside ot said container, and means at the upper end ot said conduit for minimizing the slopping ot the liquid thereinto.

3. The combination with a liquid container, of a plurality of vertically extending conduits distributed within said container and rising to a point above the level of the liquid, said conduit being vented to the atmosphere for the purpose described.

e. The combination with a liquid container, ot a conduit rising vertically within said container to a point above the level of the liquid, its lower end being vented to the atmosphere, said conduit permitting the displacement of air ,trom a hollow article when immersed in said liquid and surrounding said conduit.

5. The combination with a liquid container, ot a conduit vented to the atmosphere outside said container having an open end rising above the level of the liquid in'said container, said open end being flared Outwardly for the purpose described.

In testimony whereof I affix my signature.

DUN CAN J. FAHLMAN. 

